Underreamer



E. H. NEWKIRK.

UNDERREAMEH.

APPLICATION FILED` MAY 26. 1921.

2 SHEETS-SHEET |l WWI Ptemed May 2,1922..

WWWWZZZ mmm@ E. H. NEWKIRK.

UNDERREAMER.

APmLcATloN FILED MAY26,1921.

Patented May 2, 1922 k 2 SHEETS-SHEET 2.

entree EDGAR H. NEWKIRK, orfTULsA', OKLAHOMA.

UNDERREAMER.

L use the same.

-forreaming out This invention relates to under-reamers, or enlarging well holes, and particularly to those devices intended for under-reaming holes drilled inthe ground `for oil land gas and any other minerals or product, or to prospect for the same.

The object of my invention is to provide a device which can be attached to any standard stem ,and bit and--which will allow the drilling bit to ,work at thesame time as an in advance of the under-reamer to which it is attached.

The present method employed in drilling, is to use a bit attached to the stem, and drill the hole the same size .as the bit. Whenever it is desired to enlargethe'diameter of the hole, in order to allow deeper casing to enter, it is necessary to withdraw the bit, disconnect it from the stem and then attach an underreamer for enlarging the hole, alternating each operation. This condition applies whenever the hole is\cased to a certain point, which occurs in practically all wells.

The under-reamer attached to the bit, according to my invention, will permitdrilling and under-reaming at the same time.

With the `above and other objects in view,

which will appear as the description proj,

ceeds, the invention consists in the novel features herein set forth, illustrated in the accompanying drawings and more particularly pointed out i'n the ,appended claims.

Tn the drawings;

Fig. 1 is a cross sectional view of the-dei vice showing the under-reamer in cutting position below the casing. Fig. 2 is a side view of the same. Fig. 3 is a ldetail view in cross section, of

the under-reamer in closed position, showing the split ring which holds the cutters retracted.

Fig. 4 is a detail View of one of the underreainer lugs, or cutting bits.

Fig. 5 is a view of the-latch which holds the, lugs in cutting position.

Specification of Letters Patent.

vide a reamer justing the length of the same.

inner edges of gig. 6 is a view of one of the release slips, an

Fig. 7 is a view of the working rods.`

To put my invention into practice, I probody 1, having at its upper end a screw joint 2a for connecting it to the drillstem 2. Atthe lower end ofthe reamer body is a screwjoint 15a for connecting it to a drilling bit 16. The reamer body Patented May 2, 1922.

Application filed May 26, 1921. Serial No. 472,635.

is provided on its periphery with flat faces j 3 and 15 which are adapted to receive a wrench for connecting and disconnecting the string of tools. VIn the central portion of the reamer bodyis provided -a seriesof adjoining recesses 18 and 19 in which is secured under-reamer. Tn the recess 18 are slidably mounted the release slips 4. Secured in said slips, and projecting therefrom are rods 5 which terminate in joints 46, by means o d which they-are attached tothe .Through the medium of the joint 8 the rods' short rods 7.

7 are swiveled to the single rod 9 which projects from the recess /18 to the recess 19 an is provided with a turnbuckle 9, for adto the lower end of the rod 9, by means of the eye 13, is a horizontal vrod13 which is secured to 'and'actuates the latches 12 against the springs 14. These latches 12 are provided with beveled portions 12a and right angular recesses 12", which register with lthe the bits or lugs 10.

In .the recess 19 are mounted the underreamer cutting bits or lugs 10, which are swiveled in the main body 1 by' the pins 21 in the ear'lOa. Between the cutting lugs 10 and on each side of the rod 9 is a spring 11, which forces the lugs apart and throws them into cutting position.

17 represents the plates which enclose the latches, and 4a is a split ring which serves to hold the release slips in retracted posithe mechanism and cutting bits of the .V

Attached and to lower the casing 22 1n the hole, my c improved under-reamer is applied as fol.-

' the lugs to retract.

permits It will be noted 9, forces the latches 12 down and Y that as the rodsk 7 are forced downwardly, they'enter the slots 10b in the ear 10a of the lug 10, and through the medium of thel pivot 21, spread the ears above the pivot and retract the cutting lugsv proper belowA the pivot. 4

The string of tools is then placed in position by, lowering it through the casing 22. When the split 'ring' 4a comes inl contact with the top of the casing, it is kicked oil, and the casing itself serves to hold the lugs retracted until they reach the bottom thereof, whereupon they are automatically releasedv and spread into working position by the spring 11, and 'becomes locked when the release slips 4; leave the casing, and expand by the working'of the springs 14C;

ln raising the tool to withdraw the same from the hole, the release slips 4 strike the bottomof the casing and contract, due to the rounded edges thereof, causing thelatches 12 to release and unl'ockthe lugs I* lieved that my invention can be clearly unters Patent is bit of an under-reamer, com

10 so that the lugs upon striking thebottom of the casing, contact and allow the tool to enter the casing.

From the foregoing description, it is bederstood.

It is obvious that numerous changes may be made in the details of construction without departing from the spirit of my invention. l

What I claim and desire 1.'.The combination with a drill stem and rising a reamer body provided at both en s with a joint, recesses in said `reamer body, a set of lugs swiveled in said recesses and means for locking andl unlocking said lugs.

12. Anunder-reamer consisting of a reamer body provided with release slips, a series of working rods attached to said release slips and longitudinally movable in said body, means for adjusting said rods,

to secure by Let-4 4L. An under-reamer consisting of a reamer body provided with cutting lugs, release slips mounted in said body in such a manner as to permit their being moved inwardly and downwardly, means for holding said release slips in said position, a series of working rods connected to said release slips and projecting downwardly,

terminating in an eye, a horizontal bar en- .gagingy said eye and actuating a set of latches, and means for throwing said latches into and out of operative engagement with said lugs.

5. An under-reamer as claimed in claim 2, 1/n whlch the means for expandmg `sa1d lugs lconsists of a plurality of horizontal lsprlngs arranged on opposite sides of the Aworking rods and between the cutting lugs.

6. An under-reame'r as claimed in claim 2 in which the means for adjusting the working rods consists of a turnbuckle.

,7. An under-reamer as claimed in claim 2, in which the cutting lugs are provided lwith ears, means for pivoting said ears. to `the reamer body, longitudinally ,extending recesses in said ears, means for forcing said working rods into engagement with said recesses, forclng the ears apart and retracting the cutting lugs. y

ln. testimony whereof I affix my signature.

EDGAR NEWKIRK. 

